Self-hosted, lightweight server and website monitoring and O&M tool
The Network UPS Tools repository
A suite of Monitoring Plugins (formerly known as nagios-plugins)
A utility to safely generate malicious network traffic patterns
Floating window used to display current network speed, CPU & memory
The Active Monitoring System
Lightweight network IP scanner
Monitor temperature sensors, fan speed, voltage, load & clock speeds
Application to comfortably monitor your Internet traffic
Community-based GPL-licensed network monitoring system
An eye on your system
Open source monitoring system and time series database
BGP and RPKI monitoring tool
Raspberry Pi config for all things Internet
The open source time series database
Open-source systems performance monitor
A Swiss army knife for your daily Linux network plumbing
Zeek is a powerful network analysis framework
Apache HertzBeat(incubating) is a real-time monitoring system
Enterprise-Grade Open-Source Network Management Platform
pg_activity is a top like application for PostgreSQL server activity
A simple program to monitor your network/data usage
The core of our monitoring platform
A fancy self-hosted monitoring tool
Free and Open Source network access control (NAC) solution